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Ponderomotive effects on the expansion of a photoplasma in the microwave range

Published online by Cambridge University Press:  13 March 2009

B. Leloutre ,
J. -P. Furtlehner  and
P. Camus
B. Leloutre
Affiliation:
Service de Physique, Expérimentation et Analyses, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
J. -P. Furtlehner
Affiliation:
Service de Physique, Expérimentation et Analyses, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
P. Camus
Affiliation:
Laboratoire Aimé Cotton, CNRS II, Bâtiment 505, Campus d'Orsay, 91405 Orsay Cedex, France
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Abstract

An increase in the expansion rate towards vacuum of a plasma column with density of order 108 cm−3 and radius 0·5–2·0 mm produced by photoionization in the presence of a 9·4 GHz microwave field is found. The microwave field imposed by the TEM005 Gaussian mode of a spherical Fabry–Pérot resonator acts on the plasma through its ponderornotive force. First, the use of a potential barrier spectrometer allows us to measure the increase, in the number and energy of escaping electrons compared with the same plasma without microwave field. Secondly, the expansion of the modified photoplasma is checked by applying a small polarization voltage on the Fabry-Pérot mirrors to collect the ions. In the presence of the microwave field the time-resolved ion peak. Which presents a two-lobe profile faster than the single one observed without the field, indicates strong modification of the plasma dynamics. All these observations are interpreted by a simple model including the ponderomotive microwave force and the electrostatic plasma force, which act in opposite directions.

Type
Research Article
Information
Journal of Plasma Physics , Volume 55 , Issue 1 , February 1996 , pp. 59 - 76
Copyright
Copyright © Cambridge University Press 1996

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